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There has been considerable excitement among supporters over Mesa's impending arrival, which comes on the back of an excellent season on La Liga where he had the fourth-highest pass percentage in the division.

The £11million splashed out for the playmaker is only surpassed by the £12.5million paid to bring in Wilfried Bony from Vitesse Arnhem in 2013 and the £15.5million forked out for Borja Baston less than 11 months ago.

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Swansea have also bolstered their academy ranks with the signing of highly-rated Ajax teenager Kees de Boer.

The 17-year-old had spent the last six years in the youth system of the Eredivisie giants, but will join up with the Swans Under-18s for their upcoming Premier League South campaign.

One man who will not be arriving at the Liberty is Reading and Wales defender Chris Gunter.

The former Cardiff and Tottenham defender had been mentioned as a target for the Swans, but he has put pen to paper on a new contract at the Madejski Stadium and a move was thought to be unlikely after Kyle Naughton signed a new deal of his own with Swansea.